Exploits consists of miscellaneous, unaffiliated domains associated with delivering adware, spyware, and malware to victims' PCs, often through the use of various exploits.

Comment:

"Email Threats" consist of domains associated with advertising companies that run HTML email
advertising campaigns. These ad-oriented HTML emails may may make use of web bugs, scripting, and
rich media content, as well as various tracking technologies to record and measure impressions and
responses to ad campaigns. Also included in this category are email verification services, which use HTML email features to verify and monitor the receipt and reading of emails.